//
//  NSObject+SayHi.h
//  Category1
//
//  Created by cora1n on 14-8-12.
//  Copyright (c) 2014年 devwu. All rights reserved.
//

#import <Foundation/Foundation.h>

//采用类目实现的 非正式协议

@interface NSObject (SayHi)
-(void)sayHi;

@end
